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arXiv 2103.08645quant-phcs.LG
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基于机器学习的含时量子自旋网络层析成像

Tomography of time-dependent quantum spin networks with machine learning

School of Electrical, Computer and Energy Engineering, Arizona State University(亚利桑那州立大学电气、计算机与能源工程学院);Vehicle Technology Directorate, CCDC Army Research Laboratory(美国陆军研究实验室车辆技术部);Department of Physics, Arizona State University(亚利桑那州立大学物理系)

Chen-Di Han, Bryan Glaz, Mulugeta Haile, Ying-Cheng Lai

摘要:

相互作用的自旋网络是量子计算的基础。基于数据的时间无关的自旋网络的断层扫描已经实现,但一个开放的挑战是确定时间相关的自旋网络的结构,使用时间序列测量本地从一个小的自旋子集。物理上,自旋网络在含时驱动或微扰下的动力学演化由海森堡运动方程描述。基于这一基本事实,我们提出了一个物理增强的机器学习框架,其核心是海森堡神经网络。特别是,我们根据海森堡方程的一些物理动机损失函数开发了一种深度学习算法,它“迫使”神经网络遵循自旋变量的量子演化。我们证明,从本地测量,不仅可以恢复本地的哈密顿量,但反映整个系统的相互作用结构的哈密顿量也可以忠实地重建。我们在各种结构的自旋网络上测试我们的海森堡神经机器。在仅从一个自旋进行测量的极端情况下,所实现的层析成像保真度值可以达到约90%。所开发的机器学习框架适用于其量子动力学演化由海森堡运动运动方程控制的任何时间相关系统。

英文摘要:

Interacting spin networks are fundamental to quantum computing. Data-based tomography of time-independent spin networks has been achieved, but an open challenge is to ascertain the structures of time-dependent spin networks using time series measurements taken locally from a small subset of the spins. Physically, the dynamical evolution of a spin network under time-dependent driving or perturbation is described by the Heisenberg equation of motion. Motivated by this basic fact, we articulate a physics-enhanced machine learning framework whose core is Heisenberg neural networks. In particular, we develop a deep learning algorithm according to some physics motivated loss function based on the Heisenberg equation, which "forces" the neural network to follow the quantum evolution of the spin variables. We demonstrate that, from local measurements, not only the local Hamiltonian can be recovered but the Hamiltonian reflecting the interacting structure of the whole system can also be faithfully reconstructed. We test our Heisenberg neural machine on spin networks of a variety of structures. In the extreme case where measurements are taken from only one spin, the achieved tomography fidelity values can reach about 90%. The developed machine learning framework is applicable to any time-dependent systems whose quantum dynamical evolution is governed by the Heisenberg equation of motion.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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